linux-kernel - Re: [RFC PATCH 02/10] drm/panel: s6e63m0: Don't store+check prepared/enabled

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Message-ID: <CAD=FV=UCMsgAgdiRiL5_a7BWsj+unGZzuJrxr+OdyNfXtzsWiw@mail.gmail.com>
Date:   Wed, 13 Sep 2023 11:20:31 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     dri-devel@...ts.freedesktop.org, Maxime Ripard <mripard@...nel.org>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...il.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Sam Ravnborg <sam@...nborg.org>, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 02/10] drm/panel: s6e63m0: Don't store+check prepared/enabled

Hi,

On Fri, Aug 4, 2023 at 2:07 PM Douglas Anderson <dianders@...omium.org> wrote:
>
> As talked about in commit d2aacaf07395 ("drm/panel: Check for already
> prepared/enabled in drm_panel"), we want to remove needless code from
> panel drivers that was storing and double-checking the
> prepared/enabled state. Even if someone was relying on the
> double-check before, that double-check is now in the core and not
> needed in individual drivers.
>
> For the s6e63m0 panel driver, this actually fixes a subtle/minor error
> handling bug in s6e63m0_prepare(). In one error case s6e63m0_prepare()
> called s6e63m0_unprepare() directly if there was an error. This call
> to s6e63m0_unprepare() would have been a no-op since ctx->prepared
> wasn't set yet.
>
> Signed-off-by: Douglas Anderson <dianders@...omium.org>
> ---
>
>  drivers/gpu/drm/panel/panel-samsung-s6e63m0.c | 25 -------------------
>  1 file changed, 25 deletions(-)

In response to the cover letter [1], I proposed landing patches #1-#3
directly from here while we resolve the issues talked about in
response to patch #4 [2]. I didn't hear any complaints, so I took
Linus W's review tag from the cover letter and pushed this to
drm-misc-next.

d43f0fe153dc drm/panel: s6e63m0: Don't store+check prepared/enabled

[1] https://lore.kernel.org/r/CAD=FV=UFuUsrrZmkL8_RL5WLvkJryDwRSAy_PWTa-hX_p0dF+Q@mail.gmail.com
[2] https://lore.kernel.org/r/20230804140605.RFC.4.I930069a32baab6faf46d6b234f89613b5cec0f14@changeid/